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Method for the preparation of microcellular polyurethane elastomers

A technology of polyurethane elastomer and microporous, which is applied in the direction of elastic suspension, spring, transportation and packaging, etc. It can solve the problems of deterioration of polyurethane elastomer performance, short shelf life and high viscosity, and difficulty in handling feeding materials, and achieves the inhibition phase Effects of separation, improved processability, optimized viscosity and shelf life

Active Publication Date: 2014-09-03
SKC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the case where NDI is reacted with polyol alone, since the prepolymer thus prepared has a short shelf life and high viscosity, it needs to be operated at a high temperature of at least 100° C., thereby undesirably making the processing difficult. More difficult
And, when p-MDI or TDI is additionally used to solve this problem, the performance of polyurethane elastomer is deteriorated due to the structural characteristics of p-MDI or TDI

Method used

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  • Method for the preparation of microcellular polyurethane elastomers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Using naphthalene diisocyanate (NDI) and polycaprolactone diol (PCL2000) having a number average molecular weight (Mn) of 2000 as a polyol in a molar ratio of 0.3:1, a prepolymer with 5 wt% NCO was obtained. 5 parts by weight of diisobutyl phthalate as a plasticizer and 20 parts by weight of NDI were added to 100 parts by weight of a prepolymer with 5wt% NCO to prepare 20% urea with respect to the prepolymer The prepolymer containing the terminal NCO group of the carbamate structure, and then mix it with 85 parts by weight of water, 2 parts by weight of 2,6-dimethylmorpholine ether as a catalyst, and 1 part by weight of Active agent silicone surfactant, 0.2 parts by weight of butylated hydroxytoluene as an antioxidant and 15 parts by weight of a mixture comprising toluene diisocyanate and 1,4-butanediol in a weight ratio of 1:13 as an emulsifier Mix to obtain a prepolymer blend.

[0047] An additional amount of naphthalene diisocyanate may be used in an amount of 1-40 ...

Embodiment 2

[0051] A microcellular polyurethane elastomer was prepared in the same manner as in Example 1, except that 15 parts by weight of a mixture containing toluene diisocyanate and 1,3-propanediol in a weight ratio of 1:13 was used as an emulsifier.

Embodiment 3

[0053] A microcellular polyurethane elastomer was prepared in the same manner as in Example 1 except that the amount of the emulsifier was changed to 10 parts by weight.

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Abstract

This invention relates to a method of preparing a microcellular polyurethane elastomer by reacting naphthalene diisocyanate with a polyol to prepare a prepolymer containing an isocyanate (NCO) group, followed by mixing the prepared polyurethane prepolymer with a plasticizer, water, an emulsifier and the like, and then foaming the prepolymer blend to prepare a polyurethane elastomer, wherein the emulsifier is a mixture of (a) a compound selected from the group consisting of 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 2,4-diphenylmethane diisocyanate, 4,4'-diphenylmethane diisocyanate, hexamethylene diisocyanate, 1,4'-cyclohexane diisocyanate and mixtures thereof, and (b) a C2-10 hydrocarbon having a molecular weight of 500 or less with two to four hydroxyl groups, or mixtures thereof. The method of the invention can optimize the viscosity and properties of the prepolymer resulting from the reaction of naphthalene diisocyanate with a polyol, thus improving processability.

Description

technical field [0001] The present invention relates to a method for preparing microcellular polyurethane elastomers, and more particularly, to a method for preparing helper springs suitable for use in bicycles, motorcycles, automobile suspensions, furniture, or high-vibrating matrices. spring) polyurethane elastomer method. Background technique [0002] Polyurethane elastomers with microcellular structure have been widely used in bicycles and motorcycles due to their excellent vibration damping and impact absorption properties, as well as excellent dynamic properties under high loads, durability and permanent deformation resistance. , auxiliary springs for automotive suspensions, furniture, or high-vibration substrates. In particular, since polyurethane elastomers prepared by using naphthalene diisocyanate (NDI) have excellent flexural fatigue resistance, they have been widely used in situations requiring high durability, such as for bicycles, motorcycles, automobile suspe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08G18/80C08J9/00C08G101/00
CPCC08G2350/00C08G18/4277B60G11/22C08J9/0028C08G18/3206C08G18/7837C08G18/7678C08G18/1833F16F1/3605C08G2101/0066C08G18/10C08G18/80C08G2110/0066C08G2110/0083C08G18/7621C08G2110/0008C08G18/02C08J9/00C08G2101/00
Inventor 杨在洙崔熙映金正武李晙模
Owner SKC CO LTD
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